Embedded Matlab function, simulink loop

2012 6 10
1 个回答
3 次查看（30 天）

0 个投票

Hello.
I have been working with the matlab Embedded function in simulink and I have a problem. I am doing an on-off controller by adding many if statements like this:
if a>10
a=-1;
else
a=9;
end
In this case, a is an input and an output, so I need to feedback it. I have tried to feedback it by conect them directly, by using the workspace and using a Memory block, however I always get this warning:
"Found algebraic loop containing..."
The result is the simulation runs for some seconds but suddently it stops without a reason.
How can I solve this problem?
Thanks

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回答（1 个）

Kaustubha Govind
Kaustubha Govind 2012-6-11

0 个投票

How about if you insert a Unit Delay block in the feedback loop?

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Robinson Medina
Robinson Medina 2012-6-11
Hello.,
Thanks for your answer... I have tryed but it did not work, simulation is still unstable. Is there any command in the embedded Matlab Function block in simulink, that let me save a varible until the next sample time? That could solve my problem.
Regards
Nicholas
Nicholas 2012-6-11
Have you considered using a persistent variable type?
http://www.mathworks.com/help/techdoc/ref/persistent.html
Kaustubha Govind
Kaustubha Govind 2012-6-13
Robinson: Could you explain what you mean by "unstable" - did you mean in the context of controller dynamics? Did the error about algebraic loops go away though?
Nicholas' comment answers the rest of your question.

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